Next Mars rover will try to create oxygen on planet's surface

The
next Martian rover that NASA sends to the red planet will attempt to
make oxygen on the surface when it lands there in 2021. In addition, the
rover will carry seven scientific projects, aimed at paving the way for
future manned missions, seeking evidence of life and storing samples to
be brought back in the future.

Being able to produce oxygen could help with that ambition, since transporting fuel is heavy and expensive. Other NASA spacecraft can already produce oxygen from CO2.